Henry Coe SP has three main entrances: Coe Ranch, Hunting Hollow, and Dowdy Ranch. You can only self-register or pick up a backpacking permit on the day of your trip from Coe Ranch or Hunting Hollow park entrances. Permits are first-come, first-serve (FCFS), but you won't have any trouble securing one outside of a spring holiday weekend, like Memorial Day. Parking spots are limited though so try to get to the trailhead as early as possible.
There are designated FCFS backcountry campsites in the western part of the park, but you can generally camp where ever you'd like. Some of these campsites have outhouses, but they're not always stocked with TP.
Permit fees are $5 per person a night and $8 parking fee per vehicle a night ($6 at Hunting Hollow Entrance). Bring exact change if the visitor centers are closed, otherwise, you can pay by credit card.
In 1953, Sada Coe, the daughter of Henry Willard Coe, gave her family's cattle ranch to CA. It became the park we have today.
The Ohlone and the Northern Valley Yokuts were the area's earliest inhabitants. They were semi-nomadic tribes.
Henry Coe is home to Orestimba Wilderness, one of 12 state park wilderness areas that's designed to preserve the area's natural ecosystems